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Thread: Broken firing pin

  1. #31
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    I have never seen a firing pin do that in almost 25 years of using this weapon.



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  2. #32
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  3. #33
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    Quote Originally Posted by Iraqgunz View Post
    I have never seen a firing pin do that in almost 25 years of using this weapon.
    Thank you IG. I have far less experience with the AR but plenty of experience with machines in general and my first thought was that this pin shouldn't have broken. My second thought was there is something wrong with the pin and my third thought was that it was welded.

  4. #34
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    Quote Originally Posted by Iraqgunz View Post
    I have never seen a firing pin do that in almost 25 years of using this weapon.
    Same here. The only place I have seen them break is at the tip.
    Train 2 Win

  5. #35
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    Re: Broken firing pin

    You got 10k rounds through it. Be satisfied that it ran well and shot that much brass. You ran an estimated $3k-$4k worth of brass on that $8 part. What else would you like from it?

    Fwiw i carry a spare pin and a bcm bolt upgrade kit in my bcm grip for just this reason. Other than cleaning you cant predict this i suppose. Maybe ill start replacing them at 5k rounds.
    Last edited by Litpipe; 02-17-13 at 09:41.
    "Seriously?" -SWATcop556

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  6. #36
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    Quote Originally Posted by Litpipe View Post
    You got 10k rounds through it. Be satisfied that it ran well and shot that much brass. You ran an estimated $3k-$4k worth of brass on that $8 part. What else would you like from it?

    Fwiw i carry a spare pin and a bcm bolt upgrade kit in my bcm grip for just this reason.
    I am not too boogered up that a range gun broke, I got my $8 worth out of this pin and I had a spare right there, I was back in business in five minutes. You are missing the point but I haven't really made the point. Users are concerned about the overall reliability of their service guns, their SHTF guns, they worry about a gun failing at a critical moment. The reliability of the gun is a function the reliability of every part. A situation where a formerly reliable part is replaced with an unreliable part to save a dollar or two or to make some unscrupulous person a dollar or two is unacceptable. In this case the reliability of this bogus firing pin is comparable to or less than the reliability of the entire rest of the weapon and that's a bad situation. If this was just one firing pin there would be little reason to discuss this. If my suspicions are correct there are a lot of these bogus pins in use by unsuspecting owners.

  7. #37
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    Re: Broken firing pin

    I thought that was the intent of your post....reliability. If i sounded rude you have my appologies.

    Even gas rings must be replaced eventually. Thankfully we can do a gravity test to help us determine when to replace them. Perhaps this is a lesson/warning for us to spend the $8 and replace the pin at a set point.

    We know that some parts (few) have an expected life. I guess i will add this to my list.

    I think the other issue, and part of a larger discussion is shitty parts being placed into the retail pool. Supply being low and all...corners are being cut and some people want to save that $1 you mentioned.
    Last edited by Litpipe; 02-17-13 at 09:54.
    "Seriously?" -SWATcop556

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  8. #38
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    What you are talking about is minimum service life (or in this case Minimum Life Rounds), not reliability. In a previous post in this thread, I provided the Mil-Specs so you could look it up.....let me make it easier for you by putting a cut and paste in.....in short, you need to change the firing pins somewhere around 6,000 rounds as that is the "Minimum Service Life of a single carbine with 9 or less total malfunctions". You could expect that the firing pin may infrequently fail before 6,000 rounds as "failure to fire" is one of the malfunctions allowed before 6,000 rounds as long as the failures don't exceed 2 "failure to fire" malfunctions. Take a look at the ejector and extractor springs and "other parts" ..... some of them have a service life of 3,000 rounds or less and have allowable failures before that point.....in other words you should be changing those parts out at those points!

    Minimum Service Life as defined in the Mil-Specs is the minimum duration of use (could be defined in hours, rounds, rotations, miles....what have you)

    Minimum life rounds is defined as the minimum service life of an individual part, whether it is the original part or a replacement part, expressed in the number of weapon rounds fired with the part assembled in the weapon.


    As the cut and paste below will NOT look pretty, you are going to actually have to breakdown and do the reading in the document to make sense of it. Go to Para 3.4.7 portions of which are below:

    MIL-C-70599A(AR)

    3.4.7

    Endurance. Carbines shall be capable of withstanding the firing of 6,000 rounds for endurance with not more than the number of malfunctions and unserviceable parts allowed for both single carbine and four carbines combined as allowed in TABLE I. The cyclic rate of fire of not more than one reading on a single carbine or not more than two readings on four carbines combined, shall fall outside of 700 to 1025 rounds per minute. Ammunition used shall be Government standard M855, 5.56mm ball cartridges conforming to Drawing 9342868.

    TABLE I. Malfunctions and unserviceable parts permitted in 6,000 rounds.
    Malfunctions
    Single Carbine & Four Carbines
    Failure of bolt to lock 2 failures
    Failure to fire 2 failures
    Failure to feed (from magazine) 4 failures
    Failure to eject 2 failures
    Failure to chamber 3 failures
    Failure to extract 1 failures
    Bolts fails/hold rear 3 failures
    All other malfunctions 0 failures
    Total - Above malfunctions combined 9 for single weapon, 22 for 4 weapons

    Unserviceable Parts
    Ejector spring
    Extractor spring
    other parts (limited to trigger spring, disconnect springs, hammer spring, extractor pin and extractor)

    Minimum Life Rounds
    3,000 2 failures
    2,000 1 failure
    3,000 1 failure
    Last edited by Chorizo; 02-17-13 at 11:19.

  9. #39
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    There is very little about the weapon he is using that is mil-spec. Its a Smith and Wesson chambered in 5.45x39. YMMV.

    If I was concerned about SHTF scenarios, I would not be using a weapon setup as such as a matter of planning.
    The Marines have done much, with so little, for so long--we can now do anything, with nothing, forever.

    No Better Friend, No Worse Enemy.

    Constitutional rights are enshrined with the scope they were understood to have when the people adopted them, whether or not future legislatures or (yes) even future judges think that scope too broad

  10. #40
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    Here is a link to the referenced report. Pages 10-12 respectively

    http://www.ar15.com/content/manuals/m4milspec.pdf


    Quote Originally Posted by Chorizo View Post
    What you are talking about is minimum service life, not reliability. I have previously provided the Mil-Specs so you could look it up.....let me make it easier for you by putting a cut and paste in.....in short, you need to change the firing pins somewhere around 6,000 rounds, yet could expect to have an infrequent breakage before reaching that point........
    Last edited by Melon; 02-17-13 at 10:49.
    The Marines have done much, with so little, for so long--we can now do anything, with nothing, forever.

    No Better Friend, No Worse Enemy.

    Constitutional rights are enshrined with the scope they were understood to have when the people adopted them, whether or not future legislatures or (yes) even future judges think that scope too broad

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